A bstract Asymptotically safe extensions of the Standard Model have been searched for by adding vector-like fermions charged under gauge group and having Yukawa-like interactions with new scalar fields. Here we study corresponding renormalization β -functions to next next-to-next leading order in perturbative expansion, varying number extra representations they carry. We test fixed points against various criteria perturbativity single out those that are potentially viable. show all candidate...

We discuss various realizations of the Weyl group in background field expansion quantum gravity, presence a cutoff, as required applications functional renormalization group. To study dependence, special attention is given to split gauge transformations, which act on and fluctuation keeping total metric unchanged. The results generalize previous works global local scale transformations.

Gauge-flation model at zeroth order in cosmological perturbation theory offers an interesting scenario for realizing inflation within a particle physics context, allowing us to investigate possible connections between and the subsequent evolution of Universe. Difficulties, however, arise perturbative level, thus motivating modification original model. In agree with latest Planck observations, we modify such that new dynamics can produce relation spectral index $n_{s}$ tensor-to-scalar ratio...

We minimally extend the Standard Model field content by adding new vector-like fermions at TeV scale to allow gauge coupling unification a realistic scale. embed model into $SU(5)$ grand unified theory that is asymptotically safe and features an interacting fixed point for coupling. There are no Landau poles of $U(1)$ Higgs couplings. Gauge, Yukawa couplings retraced from matched those rescaled up same energy. All couplings, their values critical exponents always remain in perturbative regime.

We study the consistency of decoupling limit generalized SU(2) Proca theory (GSU2P). Namely, we healthiness those terms whose analysis in scalar was not originally established reconstruction full (see work by Gallego Cadavid et al. [Phys. Rev. D 102, 104066 (2020)]). Those are parity-violating ${\stackrel{\texttildelow{}}{\mathcal{L}}}_{4,2}^{1}$ and parity-conserving beyond ${\mathcal{L}}_{4,2}^{3}$ ${\mathcal{L}}_{4,2}^{4}$. Using $3+1$ Arnowitt-Deser-Misner formalism, write down kinetic...

In this work, we explore the construction of most general vector-tensor theory with an SU(2) global symmetry in vector sector as a proposal for modified gravity. We start Lagrangian containing terms involving symmetric and/or antisymmetric combinations covariant derivative field plus arbitrary function times Ricci scalar. Then, study degeneracy full to determine whether it can be healthy or not. find relations among some free functions that are necessary healthiness correspondence several...

Esta herramienta busca acercar al estudiantado método científico y su uso en clases de Laboratorio. Con cuatro estaciones, abordamos conceptos clave: Primero, revisamos los aspectos relevantes del Método Científico. Luego, las actitudes esenciales el Finalmente, trabajamos análisis datos usando Python la construcción reportes científicos LaTeX.

We explore a simple parameterization of new physics that results in an ultraviolet complete gauge-quark sector the Standard Model. Specifically, we add antiscreening contribution to beta functions gauge couplings and flavor-independent, Yukawa couplings. These two free parameters give rise intricate web Renormalization Group fixed points. Their predictive power extends flavor structure mixing patterns, which investigate demonstrate some Model could be determined by flow.

According to the literature, there is a significant number of inflationary models that lack observational and conceptual support. Such case with recent observations regarding possible preferred direction in universe, which imply scalar fields are not suitable as generators inflation. On other hand, employ vector require modification gravity and/or fine-tuning order have appropriate behaviour; besides, they naturalness do exhibit one most important properties theories modern physics:...

We will expose in this paper our advances towards a proof of the equivalence between FRW background expansion, during some period time that contains primordial inflation, and statistical isotropy curvature perturbation $\zeta$ at end time. Our motivation rests on growing interest existence preferred direction Universe hinted by continuous presence anomalies CMB data.